Simultaneous constructions present a unique linguistic property in sign languages where multiple body articulators (hands, torso, head, facial expression, and eye gaze) are used to structure linguistic information not only linearly, as is done in speech, but also simultaneously. Simultaneous constructions allow a more direct encoding of scenes and events by using various iconic strategies to depict multiple event elements (e.g. referents and their actions), their spatial relations and temporal overlap, mirroring how they are perceived in the world; that is, simultaneously. The chapter provides an overview of how iconicity is operationalized in simultaneous constructions and the methods used to study their function, and discusses the history and future directions of the study of iconicity as a structuring principle in sign languages.